Vehicular Radar Bracket Sloped Flaps Backscatter Reduction
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Solution Overview
Problem
Conventional mounting assemblies for vehicular radar sensors fail to effectively reduce multi-path and backscatter effects, leading to false alarms and reduced detection accuracy due to radiation interference between the fascia and the bracket.
Innovation Solution
A mounting assembly with sloped walls and flaps forming a radiation aperture, featuring a metal exterior and an RF absorbent interior layer of odd quarter wavelengths thickness, which intercepts and absorbs unwanted radiation, minimizing multi-path and backscatter by configuring the sloped flaps to maintain an angle of incidence less than 30 degrees and terminating at a position to form a functional aperture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional mounting assembly is used to support the radar sensor, then the sensor is mechanically secured to the vehicle, but multi-path and backscatter effects occur due to radiation interference between the fascia and bracket
Solution Approach 1:
The support bracket is divided into multiple functional segments: sloped walls forming a radiation aperture, and sloped flaps extending from the distal ends. This segmentation allows each component to address specific interference problems while maintaining mechanical support functionality.
Solution Approach 2:
The patent converts the harmful backscatter radiation into a beneficial effect by using RF absorbent material lined against the interior of the bracket. The absorbent material captures the backscattered radiation and converts it to heat, transforming the harmful interference into a useful signal suppression mechanism that reduces false alarms.
2Object-affected harmful factors
If an absorbent bracket is used to block backscatter, then backscatter is reduced, but additional unwanted multi-path is caused due to increased reflection
Solution Approach 1:
The bracket implements local quality by applying RF absorbent material specifically to the interior surfaces where backscatter occurs, while the exterior sloped walls maintain their reflective properties to direct radiation away from the sensor. This localized application of different material properties solves the contradiction between blocking backscatter and preventing multi-path reflection.
Solution Approach 2:
The bracket uses asymmetric sloped walls and flaps that are angled specifically to intercept and redirect radiation paths. The sloped flaps extend at specific angles from the distal ends of the sloped walls, creating asymmetric geometry that preferentially blocks backscatter paths while allowing forward radiation to pass through the radiation aperture.
3Object-affected harmful factors
If the sloped flaps are positioned to intercept radiation within the radiation aperture, then multi-path and backscatter are reduced, but the field of view may be restricted
Solution Approach 1:
The sloped flaps are positioned to intercept only the excessive radiation that causes multi-path and backscatter, while leaving the primary radiation paths within the functional aperture unobstructed. The flaps extend partially into the radiation aperture at angles that selectively block harmful reflections without restricting the main field of view.
Solution Approach 2:
The solution addresses the field of view constraint by using three-dimensional sloped geometry rather than simple planar barriers. The sloped walls and flaps create a volumetric radiation aperture that manages radiation paths in multiple dimensions, allowing the bracket to block harmful reflections while preserving the two-dimensional field of view required for detection.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution significantly reduces backscatter and multi-path interference, enhancing the accuracy of the detection system by absorbing excess radiation and preventing reflections, thereby improving the radar sensor's field of view and reducing false alarms.
Implementation Method 1
an interior layer of the support bracket is an RF absorbent. The RF absorbent can be absorbent plastic
Implementation Method 2
The support bracket has sloped walls forming a radiation aperture between the RF board and the environment
Data Source
AI summary
An assembly for a detection system for a vehicle in an environment has a radar sensor positioned around a central boresight axis. The radar sensor includes an RF board with at least one antenna and a support bracket configured to secure the detection system to the vehicle. The support bracket has sloped walls forming a radiation aperture between the RF board and the environment. The sloped walls have distal ends distal to the radar sensor. A plurality of sloped flaps extend from the distal ends and slope inwardly from the distal ends towards the boresight axis to intercept radiation within the radiation aperture.